Global Patent Index - EP 1101156 A4

EP 1101156 A4 20041103 - ELECTRONIC BALLAST WITH FREQUENCY MANAGEMENT

Title (en)

ELECTRONIC BALLAST WITH FREQUENCY MANAGEMENT

Title (de)

ELEKTRONISCHES VORSCHALTGERÄT MIT FREQUENZVERWALTUNG

Title (fr)

BALLAST ELECTRONIQUE A GESTION DE FREQUENCE

Publication

EP 1101156 A4 20041103 (EN)

Application

EP 99935790 A 19990720

Priority

  • US 9916513 W 19990720
  • US 12223198 A 19980724

Abstract (en)

[origin: US5936357A] A microprocessor controlled, electronic ballast operates a lamp at nominal settings and shifts the operation of the ballast away from nominal settings to reduce interference. The shift is randomized by a test-flip-[shift] routine that prevents all ballasts from attempting the same correction at the same time. On DC input voltage, the frequency of the boost controller is varied to reduce EMI. The ballast operates in bands according to the input voltage. Some bands correspond to full brightness, some to a fixed amount of dimming, and some to a variable amount of dimming. In the event of an abrupt change in load, the microprocessor changes the frequency of the inverter, thereby reducing output power and gradually unloading the boost circuit and maintaining power to the microprocessor.

IPC 1-7

G05F 1/00

IPC 8 full level

H05B 41/392 (2006.01)

CPC (source: EP US)

H05B 41/28 (2013.01 - EP US); H05B 41/2853 (2013.01 - EP US); H05B 41/3925 (2013.01 - EP US); Y02B 20/00 (2013.01 - EP US); Y10S 315/04 (2013.01 - EP US); Y10S 315/07 (2013.01 - EP US)

Citation (search report)

  • [XY] US 5569984 A 19961029 - HOLTSLAG ANTONIUS H [NL]
  • [A] EP 0394966 A2 19901031 - MATSUSHITA ELECTRIC WORKS LTD [JP]
  • [Y] US 3737756 A 19730605 - HASLEY A, et al
  • [A] EP 0291223 A1 19881117 - EMI PLC THORN [GB]
  • [A] STORMBERG H-P ET AL: "EXCITATION OF ACOUSTIC INSTABILITIES IN DISCHARGE LAMPS WITH PULSEDSUPPLY VOLTAGE", LIGHTING RESEARCH AND TECHNOLOGY, ILLUMINATING ENGINEERING SOCIETY, LONDON, GB, vol. 15, no. 3, 1 March 1983 (1983-03-01), pages 127 - 132, XP002052920, ISSN: 0024-3426
  • See references of WO 0005634A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

US 5936357 A 19990810; CA 2338507 A1 20000203; CA 2338507 C 20050125; EP 1101156 A1 20010523; EP 1101156 A4 20041103; WO 0005634 A1 20000203

DOCDB simple family (application)

US 12223198 A 19980724; CA 2338507 A 19990720; EP 99935790 A 19990720; US 9916513 W 19990720